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ACQUISITIONS AND DISPOSITIONS - Chulbatkan (Details)
oz in Thousands, $ in Millions
 12 Months Ended
Jan. 15, 2021
USD ($)
Jan. 16, 2020
USD ($)
oz
$ / oz
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Acquisitions and Dispositions        
Cash consideration paid     $ 267.0 $ 30.0
Transaction costs     $ 4.4  
Purchase price allocation        
Total net assets acquired   $ 290.5    
Chulbatkan license        
Acquisitions and Dispositions        
Consideration   $ 283.0    
Royalty obligation   1.50%    
Future proven and probable reserves per ounce | $ / oz   50    
Declared proven and probable ounces | oz   3,250    
Percentage of payment on net smelter return royalty   1.50%    
Buyback right   0.33    
Right to buyback royalty   $ 10.0    
Period for buyback   24 months    
Cash consideration paid $ 141.5 $ 141.5    
Percentage of consideration paid in first installment   50.00%    
Final installment which can paid in cash (as percent)   100.00%    
Increase (decrease) in working capital   $ 3.1    
Purchase price allocation        
Property, plant and equipment (including mineral interests)   286.9    
Net working capital   3.6    
Total net assets acquired   $ 290.5    
Chulbatkan license | Minimum        
Acquisitions and Dispositions        
Option, which was not executed, to pay installment with shares (as a percent)   60.00%    
Chulbatkan license | Maximum        
Acquisitions and Dispositions        
Option, which was not executed, to pay installment with shares (as a percent)   100.00%    
Pre-development properties | Chulbatkan license        
Purchase price allocation        
Property, plant and equipment (including mineral interests)   $ 278.9    
Land, plant and equipment | Chulbatkan license        
Purchase price allocation        
Property, plant and equipment (including mineral interests)   $ 8.0